Steam-hammer.



No. 628,599. Patented July n, |399.

.1. F. nooLlTTLE.

STEAM HAMMER.

(Application filed July 5, 1898.)

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N. 929,599. Patented my u, |899.

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STEAM HAMMER.

(Application led July 5, 1598.)

(No Model.) 3 Shasta-Shoot 2.

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No. s285995 Patented 1u|y n, |899.

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(Application filed July 5, 1898.)

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UNITED' STA-rss@ PATENT'. CFFICE.

JOI-1N F. DOOLITTLE, OF CLEVELAND, OHlO.

SPECIFICATION forming part ofiLetters Patent No. 628,;599, dated July 1,1, 1899. Application iiled July 5, 1898. Serial No. 685,159. V(No model.) l

T0 @ZZ whom, it may concern.-

Be it known that I, JOHN F. DOOLITTLE, a citizen of the United States of America, and a resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Steam-Hammers, of which the following is a specification.

rod, thereby avoiding all side strains and springing due to overhanging parts,and which is so arranged that the sliding surfaces may be of ample area to reduce to a minimum the wearing of the surfaces and the friction arising therefrom.

Further objects are accessibility for the purpose of lubrication, adjustment, or repair and the comparatively small cost of manufacture.

I attain these objectsby the mechanism illustrated in the accompanying drawings, in whichg Y Figure I is a side elevation of my improved steam-hammer. Fig. H is a vertical'section of the same with the lower part broken away. Fig. III is a plan view 0f the valve-operating mechanism. Fig. IV is a side'elevation 4of the same. Figs. V and VI represent a plan and elevation, respectively, of an alternative form of slipper. Fig. VII is a sectional plan View on line X X of Fig. Vlll. Fig. VIII is a vertical section of the steam-chest, valve, and a portion of the cylinder, taken on line y y of Fig. IX. Fig. 1X is a rear elevation of the cylinder, valves, and upper part of frame with the steam-chest and valve-covers removed.

The frarne 1 ofthe hammer, as illustrated,

through it,as shown,and has keyed to its upper n face a die 7. A steam-cylinder 8 is secured to the top of the frame and has a piston 9 fit-ted to reciprocate within it. `The piston-rod 10, which isA either integral with or secured to 4the piston, slides through a suitable stuffingboX 11 in the lowercylinder-head and carries the tup or ram 12, securely fastened to its lower end. -The ram is provided withV-shaped guides 13 upon its sides, which slide in corresponding guides 14 upon the frame. A die 15 is keyed to the lower faceofthe ram and Works against the loweridie 7 upon the anvilblock. In the upper cylinder-head is a springbuffer 1b', for the purpose of cushioning any blow which the piston might by chance in its upward stroke deliver against thehead.

Steam enters the throttle-valve chamber at 17, Fig. IX. A slide-valve 18 is fitted to slide over the live-steam inlet-ports 19, opening or closingthem, as desired. This throttle-valve is secured by suitable clamps 2O to thelower end of the rod 21, which slides through a stuffing-box 22 and is connected at its upper end by a suitable joint to swinging end of the arm 23, Fig. II, which arm is rigidly se- Icured to the shaft`24. This shaft is journaled in the bearing 25 and has keyed to its outer end the arm 26, the swinging end of which is connected by the rod 27 to the upper end of the hand-lever 2S. uA rock-shaft 29 is journaled in suitable bearings in each vertical web of the frame, onthe 'extension of which, outside of the frame, the hand-lever 28 is loosely fulcrumed. The lever 2S is provided with a slot nearitslower end to engage `a segment 30, which is fastenedto the frame.

A thumb-screw Slis used to clamp the lever in any desired position. It will readily be seen that by raising the handlever the throttie-valve is depressed,the ports 19 are opened, and steam is admitted to the live-steam 'passage 32, Fig. VIII. In smaller sizes the handlever 2 8 is keyed directly to the shaft 24, thus avoiding the interposition of the connectingrod 27. v

A slide-valve 33 (in shape an approximately rectangular frame with a nave'to receive the valve-rod 34) is fitted with steam-tight joints between its seat and a valve-cover 35. Suitable clamps 36 are provided to hold the valve in position on the valve-rod by which it is supported and reciprocated vertically. The valve-cover is rigidly secured to the valvechest by the bolts 5l and has recesses on its inner face directly opposite and corresponding in area to the steam-ports, by means of which the steam-pressure is equalized on each side of the valve. Between the valve-cover and the face of the steam-chest I prefer to interpose liners 37, of thin metal, pa'per, or other suitable material, so that by varying the number of which the cover may be at any time adjusted. Steam enters the interior of the valve through the middle port from the live-steam passage 32. When the valve is depressed, the lower port is opened and the steam is admitted through the passage 38 to the lower end of the cylinder, forcing the piston u pward,and the exhaust-steam passes out through the upper passage 39 into the valvechest,from whence it escapes through the outlet 40, as indicated by the arrows. When the valve is raised, steam enters the upper passage, forcing the piston down, and the exhaust-steam escapes through the lower passage to the valve-chest.

. arms of the double lever 44', which is keyed to the rock-shaft 29. Hinged centrally be-v tween the vertical arms of the bell-crank 42 is a double-faced `slipper 45, -which is Iitted to slide upon the inclined guide 46, which ineline is xedly secured to the ram. I prefer i to make this slipper with overlapping flanges 47, as shown in Figs'. III and IV, as it insures thevalve coming.down with the downstroke of the ram; but in hammers for some kinds of service it may be desired to allow the valve to drop by gravity, in which case I construct the slipper without flanges. (Shown in Figs.

V and VI.) I also prefer a double-faced slip. per, as it is more nearly balanced, and when one side becomes worn the other side may be placed in contact with the incline; but a single-faced slipper may be used without violating the principle of my invention.

The compensating hand-lever 48 (see Fig. I) is keyed firmly to the rock-shaft 29 just outside of its bearing in the frame and has a segment near its lower end, which segment is similar and parallel with the one described for hand-lever 28. l

In operating the hammer steam is admitted through the throttle by means of lever 28 and yits connections, which being held stationary and lever'48 being held in its lower position, as shown, the ram will rise untilthe incline has moved the center of the slipper to a point indicated by the. small circle 49, Fig. IV, when the center of the valve-rod pivot will have moved up to a point 50, thus raising the valve and admitting steam above the piston, when the piston will descend and continue reciprocating in the lower section of the cylinder.

By raising the hand-lever 48 to the position shown by the broken dotted lines, Fig. IV, the'other parts will take a position denoted by similar outlines, in which event the piston will reciprocate in the upper section of the cylinder. It will be observed that the length of stroke under thek foregoing conditions is determined by the lap of the valve; but by opening the throttle wider the stroke becomes longer, and so in order to strike a hard blow the operator may open the throttle Wide. By opening the throttle wide and then manipulating the compensating hand-lever so as to throw the valve to its highest position when the ram is near its extreme upper position an exceptionally hard blow may be struck. Through proper handling of the levers blows of any desired force may be struck.

Various modifications can be made in the details of my invention without departing from the principles thereof, since,

Having described one mode of applying it, what I claim as new, and desire to secure by vLetters Patent, is-

l. In a steam-hammer, the combination -of a slide-block arranged to slide upon an inclined guide'attached to the rear face of the ram, a forked or double-armed elbow-lever having the slide-block hinged between its depending arms and the valve-rod hinged between its other arms, an operating-shaft journaled in the frame and carrying a forked or.

double arm embracing and hinged to the fulcrum of the elbow-lever, and adistributingvalve connected by means of a valve-rod to the elbow-lever, substantially as set forth.

2. In a steam-hammer, vthe combination consisting of the following elements, the centerlines and central planes of motion of which all lie in the same plane; a slipper sliding u'pon an incline attached to the ram, a forked or double-armed bell-crank having Vthe slipper hinged between its depending arms and the valve-rod hinged between its other arms, an operating-shaft journaled in the frame and having attached to it a forked or double arm embracing and hinged to the fulcrum of the bell-crank, a valve-rod connecting the bell-crank to the valve, and a sliding valve inclosed in a valve-chest which distributes steam to and from the cylinder,l substantially as set forth.

In testimony whereof I affix my signature, in the presence of two witnesses, at Cleveland, Ohio, June 18, 1898. Y

` JOHN F. DOOLITTLE.

Witnesses:

GEORGE B. RILEY, Guo. H. WoLco'r'r.

IIO 

